Configuring Process Placement; Overview; Process; 1:N Process Redundancy - HP 5900 Series Configuration Manual

Configuring process placement

Overview

Process placement enables placing processes to specific CPUs (also called "nodes") in your system for
optimal distribution of CPU and memory resources.

Process

A process comprises a set of codes and provides specific functionality. For example, an AAA process
provides AAA functions.
Each process runs in a protected memory space to prevent problems with one process from impacting the
entire system.

1:N process redundancy

The system backs up each active process running on one node to all the other nodes. When an active
process fails, one of its standby processes promptly takes over without impacting any other service.
Each CPU in the system corresponds to a node. On a device, only one CPU exists. The system cannot
support 1:N process redundancy. All active processes are running on this CPU. In an IRF fabric, multiple
CPUs exist. The system can perform 1:N process redundancy. An active process can run on each CPU.
This 1:N process redundancy does the following:
Improves service availability.
•
• Enables the system to quickly regain reliability after device status changes, including the following:
IRF split.
Removal of an IRF member.

Process placement policy and optimization

Process placement policies
For an active process running on only the master device, it does not support placement optimization (by
displaying a configuration failure prompt). When such an active process fails, the system automatically
restarts the process. The standby processes are used for active/standby switchover and ISSU.
Some active processes can run on either the master or subordinate device. When such an active process
fails, the system uses a placement policy to select a new active process among standby processes.
The system provides a default process placement policy that takes effect for all processes. You can modify
the default placement policy in the view you enter with the placement program default command. You
can also configure a placement policy for a specific process in the view you enter with the placement
program program-name [ instance instance-name ] command. A placement policy for a process takes
precedence over the default process placement policy.
By default, the default process placement policy defines the following rules:
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